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a Normal right cochlea. The bony IS (IS1, IS2 and IS3) is complete. The interscalar ridges 2 and 3 are shown. b Right cochlea with scala communis. The septum is defective in IS2 and IS3 (black arrows). Interscalar ridges 2 and 3 are flattened. LB = Lower basal turn; UB = upper basal turn; LM = lower middle turn; UM = upper middle turn; Ap = apical turn.
